package com.alibaba.rocketmq.common.stats;

import java.util.Iterator;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;

import com.alibaba.rocketmq.common.UtilAll;


public class MomentStatsItemSet {
    private final ConcurrentHashMap<String/* key */, MomentStatsItem> statsItemTable =
            new ConcurrentHashMap<String, MomentStatsItem>(128);

    private final String statsName;
    private final ScheduledExecutorService scheduledExecutorService;
    private final Logger log;


    public MomentStatsItemSet(String statsName, ScheduledExecutorService scheduledExecutorService, Logger log) {
        this.statsName = statsName;
        this.scheduledExecutorService = scheduledExecutorService;
        this.log = log;
        this.init();
    }


    public MomentStatsItem getAndCreateStatsItem(final String statsKey) {
        MomentStatsItem statsItem = this.statsItemTable.get(statsKey);
        if (null == statsItem) {
            statsItem =
                    new MomentStatsItem(this.statsName, statsKey, this.scheduledExecutorService, this.log);
            MomentStatsItem prev = this.statsItemTable.put(statsKey, statsItem);
            // 说明是第一次插入
            if (null == prev) {
                // 内部不需要定时，外部统一定时
                // statsItem.init();
            }
        }

        return statsItem;
    }


    public void setValue(final String statsKey, final int value) {
        MomentStatsItem statsItem = this.getAndCreateStatsItem(statsKey);
        statsItem.getValue().set(value);
    }


    public void init() {
        // 分钟整点执行
        this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                try {
                    printAtMinutes();
                }
                catch (Throwable e) {
                }
            }
        }, Math.abs(UtilAll.computNextMinutesTimeMillis() - System.currentTimeMillis()), //
            1000 * 60 * 5, TimeUnit.MILLISECONDS);
    }


    private void printAtMinutes() {
        Iterator<Entry<String, MomentStatsItem>> it = this.statsItemTable.entrySet().iterator();
        while (it.hasNext()) {
            Entry<String, MomentStatsItem> next = it.next();
            next.getValue().printAtMinutes();
        }
    }
}
